The average electronic polarisability of the oxide ion (αO2-), optical basicity (Λ), Yamashita-Kurosawa's interaction parameter (A) and oxygen 1s (O1s) binding energy in x-ray photoelectron spectroscopy (XPS) of xBi2O3. (100-x)B2O3 glasses (x=0∼65) have been examined to check correlations among them and to clarify the electronic structure of the glasses and bonding character of Bi-O. Both αO2- and A increase gradually with increasing Bi2O3 content, and large αO2- values over 2 Å3 and large Λ values over 0.9 are obtained in the glasses with high Bi2O3 contents. The interaction parameter ranges from about 0·05 to 0·25 and decreases with increasing Bi2O3 content. The O1s peak in XPS spectra consists of two components: the O1s peak with higher binding energies, O1s(1), is assigned to B-O-B bonds and that with lower binding energies, O1s(2), corresponds to Bi-O-B and Bi-O-Bi bonds. The O1s(1) binding energy decreases gradually with increasing Bi2O3 content but the O1s(2) binding energy is almost constant suggesting that the ionic/covalent character of Bi-O bonds does not change significantly with composition. Close correlations are observed among αO2-, Λ, A and mean O1s binding energy. Particularly, it has been found that O1s binding energy is a good measure of the optical basicity of Bi2O3-B2O3 glasses and the interaction parameter gives good information about the electronic polarisability of oxide glasses as well as optical basicity. It is found that Bi-O bonds in Bi2O3-B2O3 glasses are more ionic compared with Sb-O bonds in Sb2O3-B2O3 glasses.
|Number of pages||9|
|Journal||Physics and Chemistry of Glasses|
|Publication status||Published - Feb 1 2002|
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry